Thanks Lex, you are right. good point for Kumar if this has some impact in his query. -------Original Message------- From: oracle-l@xxxxxxxxxxxxx Date: 06/22/04 13:30:53 To: oracle-l@xxxxxxxxxxxxx Subject: RE: Slow running Query. Juan, in your case you don't even need the nvl function -- because the result is always 3. the problem occurs with the empty set. check this out: SQL> create table blah(c1 number); Table created. SQL> select nvl(sum(c1),0), sum(nvl(c1,0)) from blah; NVL(SUM(C1),0) SUM(NVL(C1,0)) -------------- -------------- 0 SQL> Kind regards, Lex. --------------------------------------------- visit my website at http://www.naturaljoin.nl <http://www.naturaljoin.nl> --------------------------------------------- -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Juan Carlos Reyes Pacheco Sent: Tuesday, June 22, 2004 18:21 To: oracle-l@xxxxxxxxxxxxx Subject: RE: Slow running Query. Hi Lex, why you say that, could you showme why please I show you why I say is the same: SQL> select * from test; TEST ---------- 1 2 Transcurrido: 00:00:00.00 SQL> select count(*) from test where test is null; COUNT(*) ---------- 1 Transcurrido: 00:00:00.00 SQL> select sum(nvl(test,0)) from test; SUM(NVL(TEST,0)) ---------------- 3 Transcurrido: 00:00:00.00 SQL> select nvl(sum(test),0) from test; NVL(SUM(TEST),0) ---------------- 3 Transcurrido: 00:00:00.00 -------Original Message------- From: oracle-l@xxxxxxxxxxxxx Date: 06/22/04 12:43:39 To: oracle-l@xxxxxxxxxxxxx Subject: RE: Slow running Query. Juan, unfortunately sum(nvl(column,0)) is not equivalent to nvl(sum(column),0).. Kind regards, Lex. --------------------------------------------- visit my website at http://www.naturaljoin.nl --------------------------------------------- -----Original Message----- From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of Juan Carlos Reyes Pacheco Sent: Tuesday, June 22, 2004 17:15 To: oracle-l@xxxxxxxxxxxxx Subject: RE: Slow running Query. Hi, I will do t he following Try creating function indexes on composed columns you are queryin and tellme if this improves something For example you are using as_date in the where column, but you don't have a index on substr(ca_date,1,4,.... Only to avoid unncesary plsql work 1. instead sum(nvl(column,0)) I'll use nvl(sum(column),0 2. instead of decode use case -- Binary/unsupported file stripped by Ecartis -- -- Type: text/x-vcard -- File: Lex de Haan.vcf ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- -- Binary/unsupported file stripped by Ecartis -- -- Type: text/x-vcard -- File: Lex de Haan.vcf ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request@xxxxxxxxxxxxx put 'unsubscribe' in the subject line. -- Archives are at //www.freelists.org/archives/oracle-l/ FAQ is at //www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------